Red Diff is Good Diff

A patch-set that removes more code than it adds is always much appreciated. Code that doesn’t exist cannot have bugs after all! KWin, our fantastic Wayland compositor and window manager, like many others, has an Alt+Tab switcher (“tabbox”) for quickly cycling between windows. Of course having been created by KDE, there’s plenty of options for how it should behave and what it should look like. It was the fashion at the time… A while ago I noticed that the preview feature in System Settings stopped working for full-screen effects like “Flip Switch” (a Windows Vista-like pseudo-3D diagonal list of windows) and “Cover Switch“ (like the good old iTunes Cover Flow). The reason was that they set their Window type to “Popup” which normally makes sense but when loaded into the previewer helper program it had no parent window, so it refused to open. The previews also became increasingly outdated as they included various screenshots of applications. The old preview with fake windows for…